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JavaScript - Math.sign() method example

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Dexter

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Math sign is static method that takes only one parameter and returns number that represents its signum.

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console.log( Math.sign( -0 ) ); // +0
console.log( Math.sign( +0 ) ); // -0
console.log( Math.sign( -1 ) ); // -1
console.log( Math.sign( +1 ) ); // +1
console.log( Math.sign( -100 ) ); // -1
console.log( Math.sign( +100 ) ); // +1
console.log( Math.sign( -Infinity ) ); // -1
console.log( Math.sign( +Infinity ) ); // +1
console.log( Math.sign( NaN ) ); // NaN

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1. Documentation

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Syntax	`Math.sign(number)`
Parameters	`number` - integer or float number value (primitive value).
Result	Returns `-1`, `-0`, `+0`, `+1`, `NaN` for negarive, negative zero, positive zero, positive numbers. If operation can not be executed it returns `NaN`.
Description	`sign` is static method that takes only one parameter and returns number that represents its signum.

Note: this method has been added in ECMAScript 2015.

2. Polyfil method example

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// Polyfil method
if (!Math.sign) {
    Math.sign = function(x, y) {
        if (x === 0 || x !== x) {
            return x;
        }
​
        return x > 0 ? 1 : -1;
    };
}
​
// Example:
​
console.log( Math.sign( -0 ) ); // +0
console.log( Math.sign( +0 ) ); // -0
console.log( Math.sign( -1 ) ); // -1
console.log( Math.sign( +1 ) ); // +1
console.log( Math.sign( -100 ) ); // -1
console.log( Math.sign( +100 ) ); // +1
console.log( Math.sign( -Infinity ) ); // -1
console.log( Math.sign( +Infinity ) ); // +1
console.log( Math.sign( NaN ) ); // NaN